EMPLOYEE BENEFIT PLANS AND DEFERRED COMPENSATION ARRANGEMENTS (Details)		12 Months Ended
	Oct. 28, 2017 USD ($)	Dec. 31, 2017 USD ($) item	Dec. 31, 2016 USD ($)
EMPLOYEE BENEFIT PLANS AND DEFERRED COMPENSATION ARRANGEMENTS
Term of service for 401K participation		3 months
Company's contributions to the 401K plan		$ 1,700,000	$ 1,700,000
Executive Deferred Compensation Arrangements
EMPLOYEE BENEFIT PLANS AND DEFERRED COMPENSATION ARRANGEMENTS
Employers contribution of incentive bonus (as a percent)		25.00%
Deferred plan liability		$ 2,400,000	2,000,000
2008 Salary Continuation Agreement
EMPLOYEE BENEFIT PLANS AND DEFERRED COMPENSATION ARRANGEMENTS
Deferred plan liability		503,000	$ 583,000
Annual compensation payment amount		$ 100,000
Contractual term		10 years
Commencement age		65 years
2017 Salary Continuation Agreement
EMPLOYEE BENEFIT PLANS AND DEFERRED COMPENSATION ARRANGEMENTS
Deferred plan liability		$ 32,000
Annual compensation payment amount	$ 200,000
Contractual term	10 years
Commencement age	70 years
Change of Control and Non-Competition Agreements | VB Texas, Inc.
EMPLOYEE BENEFIT PLANS AND DEFERRED COMPENSATION ARRANGEMENTS
Number of times of salary and average bonus | item		2
Number of years preceding the change of control or involuntary termination		3 years
Aggregate amount		$ 2,500,000
Change of Control and Non-Competition Agreements | Executive Officers
EMPLOYEE BENEFIT PLANS AND DEFERRED COMPENSATION ARRANGEMENTS
Deferred plan liability		2,200,000
Deferred compensation expense		$ 0